First of all lets see if you get any debug warnings or errors, go to:
C:\Program Files (x86)\MTA San Andreas 1.5\MTA\logs (Or wherever your MTA is installed to)
Open clientscript.log and go to the bottom of the file. Select the last bit include at least the last 2 "INFO: Logging to this file ended" lines (make sure that you've pressed X when you last played), copy and paste it here. Example:
INFO: Logging to this file ended
[2023-02-11 21:17:00] ERROR: CITss\ss.luac:50: exports: Call to non-running server resource (CITui) [string "?"]
[2023-02-11 21:17:00] ERROR: CITss\ss.luac:60: exports: Call to non-running server resource (CITui) [string "?"]
[2023-02-11 21:17:00] ERROR: CITss\ss.luac:72: exports: Call to non-running server resource (CITui) [string "?"]
INFO: Logging to this file ended
Oh and uhm is it just me or is there a tiny bit of GUI window visible at the bottom of your screen? Perhaps for some reason the GUI is being created off screen for you.
I've added a command, go in-game, press X twice, then do /debugcliwinpos and paste the chatbox messages that appear to here. Mention me (say
@Arran) when done.