With some older ThinLinc versions, the license files are no longer accepted after 2013-02-23. This can be seen with tl-show-licenses:
2013-02-25 08:51:19 WARNING vsmserver.license: Failed to verify signature on /opt/thinlinc/etc/licenses/my.license
10 concurrent users. Hard limit of 11 concurrent users.
ThinLinc version: 3.2.0
This problem affects ThinLinc 3.2.0 and older. These versions are still supported:
Command that fixes this problem:
perl -pi -e 's|"-text" ,|"-text","-noverify",|' /opt/thinlinc/modules/thinlinc/vsm/licensehandler.py
An email has been sent to thinlinc-technical, with the command in comment #1. Closing.