Bindings Panel shows no session variables

I need to build some page access rules with SecurityAssist in Databridge, but I cannot find any session variables in the bindings panel.

If I try to add a variable it does not show in the panel. With old SecurityAssist (standalone) I never had this issue. Please look at screenshots.

If I open an older site in the files panel, session variables can be seen as usual.
(using DW 5.5 / win7/64)

I have created a support ticket so we can look into this issue further.

To view and edit your support ticket, please log into your support history:
supporthistory.php

If anyone else is experiencing this same issue, please append to this thread.

Thanks to Jason's help this issue could be solved.
It seems it was not a problem with DataBridge at all but for a reason I don't quite understand, the DW folder "_notes" in the main directory could not be updated and had to be deleted entirely on the testing server (might have been an issue with access rights)
After we deleted this folder it could be re-created and the problem dissapeared, i.e. session variables could be created and showed up in the Bindings Panel.
Thanks again for a great online support, even if it was connected with DW and not with the extension.