We have had a license for PGP Netshare for 4 years with no problems. We recently upgraded one of the licenses to version 10.1 to be compatible with Windows 7. The other two PCs still have 9.6 on them. We are now having problems if one of the 9.6 users access a file followed by the 10.1 user trying to access the same file twice. Any ideas on what is causing this? If the 9.6 user is not accessing the file, the 10.1 user has no problems decrypting the file multiple times. Is the program somehow keeping track of how many users are using the file?