Client startup-> Critical error receiving profile data. [...] Slot stackslot cartridges in item [...]

Sorry dwArt I've only just seen your thread until now, have you managed to fix the problems with your game?

you need to open the profile file with a text editor and find the line by identifier with the slot id parameter with an error in the inventory. The error is that the game most likely wrote an incorrect parameter to it in the "location" line, this parameter. For me, this parameter simply changed to 25, although it should have been 23

Quote from Rad Roach

Sorry dwArt I've only just seen your thread until now, have you managed to fix the problems with your game?