Opengl working under 64-bit computer

Hi anyone.
I have the following problem. I’m testing my program on two computers. It works fine on 32-bit computer, Vista operation system. But I have some trouble when I’m working on 64-bits Vista computer. I must make small resize or press mouse button in order to opengl start works. I found the trouble is observed on 64-bits PC only. It doesn’t depend from operation system( XP, Vista and etc.). I found also that it’s connected with using of glEnable calls. But what is the difference in working of the 64 and 32 computers? How can I solve my problem. I can give more details if it is necessary.

Have you tried other programs that use GL?
Have you tried games that use GL?

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