GMaps v3 IE poly/marker bug

Update

This bug is caused by the 2 Mar 2011 release of GMaps 3.4. Revert to 3.3 until a fix is released.

apply poly [remove]
apply markers [remove]

Test 1

1. apply markers, 2. roll over markers. All is fine (other than IE being slow)

Test 2

1. apply poly, 2. apply markers, 3. roll over markers. Bug causes markers to disappear instead of changing.

Other stuff to try/note;

Removing polys doesn't fix the problem. You have to reload the page to clear the problem. Creating a new instance may work too.
Applying polys after the markers doesn't trigger the bug
Rolling over visible markers will typically cause missing markers to re-appear.
At some lat/lng centers the bug will manifest when the markers are first draw, causing some markers to be missing or clipped. Try this by dragging the map and clicking "apply markers" to have them cleared and redrawn at the new center.

Thoughts

The clipped markers suggest that there's some interference between the overlay tiles and the markers.
Digging around the DOM, there's evidence of "gm_v:shape" nodes even when polys have been removed. As these elements aren't evident prior to applying polys, and given their naming, I suppose that they're used for Google Map vector tiles.