Problem with accessing sheet in multiple sheet drawing

[Paul-Mason]

I have a dwg file with three sheets in, just default names, I can access sheets 2 and 3 but get the attached errors when trying to access sheet 1 form either sheet 2 or 3

This file was originally created in IV2009 I've had no problems then or with the various conversions of it.

It seems to be memory related so here's the sitrep as for memory 8GB DDR2 RAM, and Virtual Memory set at min of 8192MB and a Max of 16384MB, I did have it set a systems managed but that gave a warring of low vertual memory with almost every drwaing file that I opened.

I'm NOT seeing this message with any other files creted at the same time/version onf IV as this one.

[Paul-Mason]

Well it looks as if it fixed it self . The file in question opened OK, today, I was able to access the sheet 1 that was causing the problem yesterday.

No changes or anything made to the file or my systems set up.

So this question is dead. But I'd still welcome some thoughts on possible causes.

That's SODs LAW for you.