Cannot overwrite PDF files on network drive after 11.0.10 update

We've upgraded multiple systems running Windows 7 Professional with latest Microsoft patches from Adobe Reader 11.0.9 to 11.0.10 and we've run into an issue where users are unable to save over an existing PDF file on a network drive after adding a signature.  Reader acknowledges the document exists and offers to overwrite, and comes back with no error, but when we re-open the document, no signature appears.  If we save the file to a new name (such as the suggested "document-signed.pdf") that works, and we can then rename/copy the file.  However, when saving documents to the local "My Documents" folder, the overwrite is successful.  This appears to be a bug in the 11.0.10 release -- how can we best report this to developers?  (Or did I just do that?)

Thanks!