Assura->Run DRC failing to allow Modify avParameters

Under the current setup on the Linux server I must use, the user
interface window resulting from selecting Assura->Run DRC will not
allow the modification of any avParameters. Pressing the button has no
affect; the message in the ICFB window is:

*Error* ilGetString: arg must be symbol or string -nil
<<< Stack Trace >>>

Additionally, if I run the DRC check with just the basic .rul file and
no options set, Assura returns an abnormal termination error message in
the .log file:

....

Work Directory: .

*FATAL*Invalid arguement for ./project_name.bcr
....

*ERROR* Abort - run abnormally terminated

If anyone has any advice on how to trace the cause of these problems,
which are likely related I would very much appreciate it.