I have the same experience.
We use Boxcryptor (Unlimited Business Team License) in GoogleDrive on Vista and Win7.
We open a Word or Excel file <u>that is located in the BoxCryptor drive</u> and modify the file.
On both the Vista and Win7 machine, when trying to use WOrd or Excel's "Save as", on several occasions the file can not be saved to a location in the Boxcryptor-drive.
(I did not check other file-locking applications yet) .
A "Save as" to a location <u>outside the BoxCryptor drive</u>
(I checked to outside the GoogleDrive) works without problems.
The BoxCryptor log-file does not show any abnormalities in case of said "Save as" problems.
I tried the suggestion found elsewhere in this forum to change the way the BoxCryptor drive is mounted from "virtual" to "fixed", but to no avail.
Surprizingly, some Word or Excel-files in the BoxCryptor drive never seem to show the problem, others files always.
All GMail accounts involved in the GoogleDrive have at least RW rights, but GD ownership of the files can vary. I am trying to find a link between GD(non-)ownership and the "Save as" failure ...
I did not have an opportunity yet to check this in a BoxCryptor drive outside a GoogleDrive folder.
Any advice is appreciated.