Convert A1size of PPT to PDF

[lovewa]

I have a A1size PPT file, I would like to transform it to be a PDF file.
I installed the newest version of PDF printer (6.0.0.865)
When I set the page size to be A1 in the configuration of PDF printer, there is an error message shows that
Error 1007: An error occured while running Ghostscript
%%[Product Name: GPL Ghostscript]%%
%%[Error: undefined; OffendingCommand: _Packet]%%
Run converter to create PDF file

But when I test with another computer with previous version (may be 6.0.0.2XX)
It seems to work well for all my A1 pages.

So, I tried to find out the problem....
I found, some of A1 pages can be transformed, but some of them can't.
I don't know why...Can someone help me? Thanks a lot!!