Bruce Chapman provided solution for IndooGrid and Ifinity URL module compatibilty.

The specific problem is Wizard steps, which created a Url like this:
http://www.domain.com/Default.aspx?&ctl=Edit&mid=477&tabid=95&wizardid=1&wizardstep=1

The Url Master module detects this as an 'unfriendly' url and forwards it to a friendly version, but unfortunately, due to the pattern where the first parameter in the querystring is null (ie ?& instead of ?tabid=148&ctl=edit) the redirected Url loses all the detail.

This is easily fixed, however, by implementing a rule in the Url Master settings to ignore the redirect for this particular Url. Bruce added a compatiblity section in wiki for IndooGrid :
http://www.ifinity.com.au/Products/KB/Url_Master/topic/Indoogrid

The rule takes 30 seconds to add and allows the module to work as normal.