So i have just installed the new jj2+ update and when i'm trying to join a server this appears:
https://s7.postimg.cc/pqa39nc2z/Capture.png
yep a white empty screen i remember that the last update had a "DOWNLOADING" text with files names and downloading percent but now it shows this:
https://s7.postimg.cc/ylaxk560b/capture_2.png
no text or anything just a black loading bar and after the black loading bar finishes there is no level name like in this photo:
https://s7.postimg.cc/pqa39nc2z/Capture.png
And sometimes when i join some servers it crashes and shows me this message about an invalid animation or something like that :
https://s7.postimg.cc/6xy862097/capture_3.png
Sometimes also when i join a server the level name appears with weird letters
Does this happen only at me? and is there any solution??

This is not something I remember hearing about before. What are the file sizes of your plus.j2a and plus.dll files?

plus.dll size is 3,824 kb
plus.j2a size is 210 kb

It looks like your JJ2+ is trying to read an earlier version of plus.j2a elsewhere on your computer, either in your Cache folder or in a folder listed in the AdditionalFileFolders in your plus.ini.

Soo...what is the solution??

It depends somewhat on why that plus.j2a is there to begin with, but it comes down to this: don't have an earlier version of plus.j2a in a folder that JJ2+ reads from. Assuming you don't have a plus.j2a in your cache, because I can't think why you would: either update that other installation of JJ2+ to version 5.6 as well, or else remove the folder from AdditionalFileFolders.

I found that i had plus.j2a and plus.dll in my cache and in my jj2+ folder....
I just deleted the ones in the cache folder and the game was fixed
Thanks for the help.