Hum, if for more than 5 minutes there's no log (general log market) it means that there's a "problem in progress" (see the error console log, or Dos windows for BAT launch). If time is more than 30minutes, some crash has happens and it's better to restart market.
In the next version, i will give a view of Ping/Pong/Trade in progress, so you could understand what's happening
I dreamed about this feature since buying cat :-)
How can i help you localize the problem with this market log freezing? May be you need markets log screenshots?
This problem is annoying and produces big profitability decrease.