hi, yes i am using pro atc/x ... and have the same issue yesterday when try to put approach to FSIA on the dep/arrival page of fmc .... the Windows events shows that at the same moment there was an error on fsx. exe on the module gdipluss.dll ...
i willl try installing sp1c ... and i did not see yet the pro atx/x fórum ... for check if someone report something similar ...
regards
Carlos