I've been told (but so far not been able to test fully) that the bug has been fixed in 5.4.5.
Well to be accurate our account management tech support said the dev's have not been able to re-produce the bug in 5.4.5, so sounds like the fix is a by -product of annother bug fix.
As I said I haven't tested it yet so if you try it, let us know. Our 100Es on 5.4.4 are in production so I don't want to install 5.4.5 until it's been out for a little while longer and I can have some confidence that there aren't other issues. 5.4.5 seems fine on our development kit at the moment to be fair.