FFP on a Terminalserver

Hello,

We are trying to implement Firefox Portable on our terminal servers.

Current situation:
A program calls an instance of ffp locally to display data. The users have the option to enable a timer that refreshes the data every X minutes, which means that it opens another instance of firefox and shuts down the old one.
As long as the instances are local, everything works fine.

Now we're trying to implement this program on a terminal server, so several users access firefox portable at the same time. With default settings they get an error, that firefox is already running but not responding and should be shut down first.

In the FirefoxPortable.ini we set the variable runlocally to true.
This works so far. Several users may start FFP on that server at the same time.

The problem now is, that if they enable the timer to refresh the data, they get the following error once the second instance starts up:

Error: Platform version '' is not compatible with minVersion >= 1.9.0.6 maxVersion

Help would be much appreciated.