>>What you suggested the error is in VFP.EXE
>>VFP caused an exception 10H in module VFP.EXE at < address >.
>>
>>In my case the error is in VFP500.DLL
>>VFP caused an exception in module VFP500.DLL at < address >.
>>
>>...
>If I recall correctly VFP500.DLL was the run-time library. Since VFP.EXE wouldn't be distributed, the error would reference the run-time DLL if that were in use. Still, it's just a stab in the dark.


I also get the window illegal operation error problem for my Canon LPB810 Laser printer and Canon S400SP bubble jet printer during report printing. here is my case :
My exe file size is around 5.5MB, which include around 120 reports. Every time I do a program revision and compile the exe, I will set the frx file TAG and TAG2 to '', and every thing run Ok in the project source file. When running the exe, sometime I will get window illegal operation error for some of the report, and recompile the exe will solve the problem. Any conclusion? VFP compilation problem?