I've also changed how data is loaded when the sheet opens.
ISSUE FIXED. PLEASE REPORT ANY ISSUES IN SITE DISCUSSION
Guys, I'm afraid I wont be able to continue this game. I tried hard ... but when I thought I'd see a silver lining at the horizont, I got a new mutliday trip to one of our major customers in scandinavia. With 6 hours notification as topping.
Given my latest change in responsibilities (a result of that trip), it doesn't seem as if this situation will change too soon. So I'm afraid I'll have to drop GMing for the time being. Sorry if I disappointed you.