Autocad Express tools - file tools - Save all drawings

I use a ACAD 2013, it's worked with a Windows XP and i did have not a problem like this,

Now i change by a 'Windows 7 - Enterprise - 64b' and now I have the following problem:

The comand 'Autocad Express tools - file tools - Save all drawings', now, when i use it, the command, it don't save a thumbnails preview, for me looking for when i open the files ...   It save all of open files, but a lost the thumbs. ( until like, when the thumbs already exist.)

When i save the files one by one, with a simple command 'save', it save the thumbs normally..

I use this command very much, and i would like to know if have a fix for this ...

Thanks for your cooperation,

I hope you understand my English...

Emerson