The issue described in #1024 does indeed seem to be fixed by v2.143. 
However, there are still other related bugs.  I get the impression that
some data structure is not getting properly (re)initialised when points are
deleted.

Example:
  http://nick.brown.free.fr/stuff/gmapbug.html
(note that this contains an explicit request for API v2.143).

To demonstrate:
1. Click the north-east vertex of the red polygon to delete it.
2. Drag the hypotenuse to create a new north-east vertex.
3. Click the north-west vertex of the red polygon to delete it.
4. Drag the hypotenuse to create a new north-west vertex.  The point is
shown but the lines leading to it are dotted.
5. Continue clicking and dragging and watch things get very messy.

Problem verified with Firefox 3.0.5 and IE7 on Windows XP SP3.

Thanks for looking,
Nick