Sensation

Initial comment, this question/inquiry belongs to the Help Desk forum, but here's the reply you're waiting for:
If you haven't already, I suggest downloading and installing the All-in-One package. Using the small client is doing no-good. Further, the installation should be in a new folder and not one with an already existing RO folder containing another server. Forsaken uses its own variation of an installation and it is advised to only use that one.
Besides that, I advise getting the Open Setup and use that to make configuration changes, make sure the lower left icon is glowing for .REG and _not_ LUA, else you will receive errors.
For patching kRO and RagRE, you can use the already supplied rsu patchers, or retrieve the most recent ones, which you can find here. That should be sufficient to get you back on your way. Before actually launching the forsaken client, make sure you open the ForsakenRO-Patcher first.

After you have downloaded the All-in-One package, you can use the ForsakenRO Patcher to update our server files, for kRO/renewal you can update with rsu-kro-renewal-lite.exe and rsu-kro-rag-lite.exe.
33 BGM files is what is provided in the All-in-One installation, this is normal.
In forsaken city (fcity) you can change your job, the Job Mistress is next to the staircase where you can change your job at certain levels. But you're free to do the quests for your character as well.

The spawns are randomized, so the chance for the same one to spawn also exists. Keep killing the MvP until you get the right one.
Also see qtpi's answer:
 

Based on your description you were able to log in before without any issues?
Being stuck on 100% could mean various things, connection issues, a corrupt file which prevents the game client to load the right data and probably a few other things. I have a few suggestions you could do:
Flush your DNS cache. This is known to sometimes help. For instructions, see this. Use open/public DNS services, a guide by Google is written here. You can opt using different DNS servers if you're a little privacy focused as well, this is just a guide to show you how its done. Consider a complete re-installation after completely removing your current installation. Make sure you will install in a new folder without any prior RO installations. Get your files patched up completely, this means kRO, Sakray and most importantly the FRO patcher. Kindly posting back after you've carried out these steps.

Hello Poppet,
With F12 you should be able to cycle through your skill bars. If they aren't visible at all, you may need to check your setup.exe and set a resolution that corresponds with your screen settings to be sure that no windows fall outside of viewing range.
You can't display all 3 skill bars at the same time in FRO's client, only show 1 skill bar at a time. However, using battlemode (/bm) you can use all 3 skill bars at the same time nonetheless.
If anything is unclear, please let us know.

You can try multiple things
Just restart the game. Disable any applications besides RO. Also check your systray, lower right of your screen, for any active applications that came with your mouse/keyboard etc. In short, disable stuff that could cause the ragnarok game shield to trip and restart the game.

Initially you could try to open as administrator to see if that helps you on running it for this (first) time.
Also, please elaborate if you downloaded the All-in-One package or just the small client. If it's the second option, please reconsider and download the All-in-One client and install it in a new folder with no other RO servers in there.

Could it be that you crash whenever you enter Prontera?

Let's start with resetting your character position. Follow the information detailed in this post/guide:
After that, you will need to update your clients, which mean use the FRO patcher and the kRO & Sakray patchers. Since FRO uses their own custom creations and setup, they are akin to deviate from other RO sources. Due to this, it is advisable to only use the All-in-One installer. Make sure to install in a clean and new folder where no other RO servers are possibly installed. Then run the game from that location from now on.
Please post back with results after you've followed all steps.

Is this scenario at random, or only happens when you visit a specific town, field or dungeon? Are you maybe noticing a pattern when or why this is happening? Could also be related to things like alt+tabbing to a different screen during loading screens, launching other full-screen applications (including videos) or something completely non-related to the game itself.
Kindly answer these questions and we'll see what we can do from there.

Did you by chance only install the small client instead of the all-in-one? If that is the case, I would advise you to download the All-in-One file and go through the installation steps (again). If the problem still persists, kindly provide us with more visual indications as to clarify your issue better. Since it is a blinking animation you are describing, you could resort to something like a gif-recorder.

If you are using a non forsakenRO, RO base, then that is where it goes wrong. Since FRO is unique in its own package, you will most likely have map files that do not correspond to FROs package. If you haven't already, I advise you to utilise FROs All-in-One Installer. Make sure you update everything (mainly using the Forsaken Patcher) before you launch your game. If you already did these steps, please if possible retry the above steps after a complete removal of previous installation. Make sure you install FRO in a fresh/newly made folder and don't overwrite a current installation, since this most likely can be a cause of problems.
Kindly post back with the results.

If this problem persists, you could try downloading OpenSetup.
You should see an image similar to the following image:
Make sure that on the lower left, the "REG" one is clicked before you make any changes. Press Apply -> OK. Restart ForsakenRO and see if this worked.