Hi Tomas,
Unfortunately there are almost always bugs in Mono and these are beyond my control, it works correctly on windows. I do my best to try to support Mono with mojoPortal but I cannot recommend using Mono for important production sites because there have always been bugs, with each new release of Mono (from 2004 until today) some bugs get fixed and some new ones appear, so it is always a your mileage may vary kind of thing using Mono.
Best,
Joe