Ok - an unusual one this (I think). It seems that whenever another program tries to open a web-page (I can't be too specific to one program - it seems to be a universal problem) the program or windows will tell me that it could not open the given url (despite the fact that k-melon starts and opens it up fine).

I'm not sure how much this problem is due to k-melon (I haven't had this with any other browser so I presume it is) or due to the programs or windows. But why would others work (obviously when they are set as default browser) and not k-melon?