Bazaar 2.0.0 released and bug 375013

[David Ingamells]

When I upgraded our site to version 2.0.0 we started hitting the problem 
reported in

https://bugs.launchpad.net/bzr/+bug/375013

with every commit. In the short term I've had to go back to our previous 
version: 1.7

The existing stacked branches (which number over 30, so the workarounds 
suggested are not attractive) were all made with version 1.7 and we have 
never encountered this problem before.

The stacked branches have version as reported by "bzr info":

Standalone tree (format: 1.9)

The parent has (it has no working tree):

Repository branch (format: 1.14 or 1.9)

I have some questions, the answers to which will help me decide how to 
best get version 2.0 in use:

1) Does this problem exist if the stacked branch was made with version 2.0?
2) Will a fix be released for this in 2.0, if so when?
3) Is the problem related to repos format 2a vs non-2a?
4) Is there a sequence of format upgrades in the parent repos that will 
help (given that to keep everyone working during the changes I must only 
create formats that version 1.17 supports)?

Thanks in advance,
David.