Client switches codepage on SQL

Something weird has been going on with my Navision client lately: When I open a company on SQL Server, it displays the characters as if the codepage was wrong. If I close the client and restart it, everything is fine. It only happens the first time I open a company after booting the computer and only with companies on SQL Server. System is Win XP Proffesional, SQL Server 2000 SP3, NA 3.60 HF 19. If anyone had similar experiences, please help me. It’s not a big deal but it’s really annoying, and sometimes causes runtime errors. Thank you, Jurica