My gamemode works fine on windows but when started on linux every function that uses y_va skips the formating and returns 'YSI Warning: Bare ___ usage found' in server_log.

Help? 

Someone also reported the same issue to me where y_va didn't work at all in Linux. I've not tried out myself though, but can you show your code here that shows that warning?

Managed to solve it actually, updated to ysi 5.x using sampctl.

i was going to say, this was fixed recently. The issue was actually an attempted startup speed optimisation in amx_assembly (codescanner.inc), but it didn't work.