After some more testing I found out the problem occurs only when using "Show File", there are also some other strange errors when using "Show File", like not finding a specific record.
The major problem is I can't get content from an URL. This is problematic because I use this for getting reports from Bird. An other problem is I can't get generated documents with the "Create Document" plugin. I could use a "Callable Service", but I don't want the URL known to the end-user.
In a previous version of Tersus this worked well and again it only occurs in a Linux environment in server-mode (tested with Suse and Ubuntu).
For convenience a test-application test1234.zip
For best results, use the Firefox browser..