OWB 11.2.0.1 – Known Problems/bugs resolutions ?

OWB 11.2.0.1 – Known Problems/bugs resolutions ?
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We are using OWB 11gR2, Java(TM) Platform 1.5.0_17, Oracle IDE 11.2.0.1.0.
We are finding the strange behavior in OWB Design center. Here is the situation.
1) OWB Design Center>Databases>Defined Module> Mappings>MAP1>Mapping Editor>Expression Editor>
Output attributes>Expression Builder
Specify the expression and press OK.
Another Expression Builder opens up with blank window. We need to specify the expression again.
2) Same as above after opening expression Builder, if we go to another apps (eg. SQL Developer, MS Word) and come back expression Builder disappeared from the context.
We find only Expression Editor. Design Center Hangs. It is not responding to any KEYs. We need to kill the application via task manager and re-start.
Are these issues related to OWB client piece or OWB Client+Server piece?
We did not find any events reporting at DB alert Logs for such events. Do we need to set up some trace ON to record such events?
Are there any log files/tables record such events at OWB repository level to trace back?
Do we have OWB 11.2.0.1 known issues/bugs, resolutions list posted somewhere?
Thanks in helping.

We reviewed the release notes, where it says this patch will improve performance (Bug 7359939).
We find another note in metalink (provided by our DBA team) says
Poor Performance of Mapping Validation / Generation in: OWB 11.2.0.1 + Megapatch 10270220 and OWB 11.2.0.2 [ID 1303177.1]
Are we going to face a new problem after applying this patch?
Thanks in helping.

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