Denis, can you provide additional detail which platform and Eclipse
distribution you are using? Can you provide steps to reproduce the problem?
Is Mylyn still listed under Help > About after the update? What is the
output if you start "eclipse -console" and type "ss mylyn"?
Note that there are known problems with shared installations that can cause
features to disappear when updating features that are part of the platform:
> after an automatic update from Mylyn 3.3.0 to 3.3.1 on a Eclipse 3.4 all
> Mylyn views and buttons disappears. There was also no Mylyn brunch in the
> Preferences dialog anymore.
> After uninstalling the update coming back to Mylyn 3.3.0 all works well
> Any hints where it can come from?
> What I had encountered last year (December 2009) before this happens is
> that several attempts to update to a new Mylyn version (don't remember
> which one but I guess 3.3.1) had failed.
> Regards, Denis