I'll try and do my best to explain how things went:

1. I was fighting Vanaduke with Talbain, everything went smooth (except for the dieing part)
2. My client suddenly "poofs" away for no reason. I did not check if the actual process closed, since my thoughts were more focussed on getting back into that fight.
3. I opened up a new client and logged into it. There the following happened:

• The loading screen was showing me a part of a what seemed to be incredibly oversized resolution-window. The only things I could see were 2 gears rotating around, as how it usually is on the loading screen. They were shown at the top left and right corner with a black stripe of something else above it. That last lead me to concluding it was only part of the full screen.
• After the game loaded me back up, I saw the game perfectly normal. Except.. there was no UI of any kind. Chat functions did not seem to work (or atleast I couldn't see them, since the chatbox was gone too). Respawning didn't work either. Doing it with energy was not possible of course, since that part of the UI wasn't shown either. Doing it the other way didn't work too. However! Hitting esc would make my cursor change to how it normally changes. The normal *beep* was there aswell. My best guess, the UI was just as oversized as the loading screen. So everything of the UI was shown, just way, way out of bounds?

After that I tried reclienting again, which gave me the same results. I signed off my windows user and logged back on, after that everything was normal again.

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Computer-performance-wise: My laptop has no problems at all at running this game. Hardware can't be an issue. Software, well I had a pending java-update. However I did a previous update of it only last week, so my java isn't really out-dated. My video-drivers should be up-to-date aswell.
I do find it annoying that I forgot to check my task manager to see if the process was still running or not. Would there be any logs or so that could tell me what happened after the client poofed?