Thread:Extension talk:Header Tabs/Semantic maps not displaying right in tabs

Hi I'm running HeaderTabs 0.9.2 on MW 1.17.4 and SMW 1.18alpha with Semantic Maps version 1.05.

I have two tabs. Each has a Semantic Google map in it. The one in the first tab shows fine, but when I switch to the 2nd tab, only the first top left tile of the map is displayed. If I refresh the page it the map then shows fully, but I can't expect my users to refresh the page every time they switch tabs.

Any idea how I can fix this?

Thanks