Issue navigating between WebDynpros (containing Powerlists) in NWBC

Hello,
Let me try to explain my problem:
I have 2 powerlists contained in 2 different WDA.
"Powerlist A" contains an action button wich calls "Powerlist B" (through lo_window_manager->create_external_window passing webdynpro B url), and same "Powerlist B" has an action button to call a standard SAP transaction (OBN Target).
All roles has been added in PFCG.
All the action buttons works if the webdynpros are opened separately. for example:
Opening Webdynpro B, shows the powerlist B, and clicking on the action buttons trigger the SAP transaction on a new tab successfully.
but, if I call webdynpro A, shows powl A, then click on action button from A, it shows Webdynpro B in a new tab (and until here is fine), but when clicking on action Button B, it doesnt trigger the SAP transaction.
Is it because the webdynpro B is opened using "create_external_window"?
how this call has to be made?
I tried creating a transaction to open Wendynpro B, then assigned to a business object and created an OBN target for it, tried to call that OBN target from handle_action of A, but I have the same result: Powerlist B open suscessfully, but the action button of B is not opening the standard transaction.
Any clue about how to solve this issue?
Sorry if is hard to explain, but the scenario is quite complex. If you need more details please let me know and I'll try to explain better.
Thanks in advance

Well, we got the issue resolved, so here is what we did, in case anybody is interested:
Tested again our portal with multiple versions of Internet Explorer, in particular IE8 and IE6, the Webdynpro behavior was normal (no timeouts or locks). It even worked when we installed IE7 in a brand new machine and tried our portal.
So we started suspecting if maybe the particular IE7 that we install internally (with specific settings and policies) may be the culprit. We took a desktop that was producing the timeouts and used the following options in IE7:
Tools->Internet Options->Advanced(tab)-Reset Internet Explorer settings
and, voila! the next time we ran there, the portal did not create any timeouts.
We even asked our desktop support team to uninstall and reinstall IE7 in the same machine after we did the reset, and even after the re-install that the timeout problems did not re-appear.
One of the things that the "reset" option does is delete the Add-ons used by IE.
So as a last test, we took a machine that was presenting the problem and went to the Internet Options to disable all the add-ons (in the Programs Tab). The error disappeared.
And even after enabling back all the add-ons, the error would not return.
Conclusion:
Without being able to pinpoint the specific add-on (or combination) that causes the problem, we suspect that some of them conflicted, causing IE7 to behave abnormally. Disabling them all, restarting Internet Explorer, and enabling them again, makes the WaitingEventQueue.js work as it should

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