Hi,
If the problem resides on the server then the logs to check include:
../CSCOpx/MDC/Apache/logs/error.log
../CSCOpx/MDC/tomcat/logs/sdterr.log & stdout.log
A couple of items to note:
Try the same action from a different client machine and also try using a different browser such as Firefox as it seems to display better error message.
Thanks!