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thank you for posting details of the problem. Our engineers are investigating it as we speak.
We can take if offline if you are not comfortable sharing additional details on a public getsatisfaction forum.
my email address is akomolov at exadel dot com
In any case, Ill post an update as soon as I have any news from developers
more on error #1:
it seems that the url got corrupted/misstyped when manually copied/pasted in a browser.
At least, that was the only scenario we could come up with.
We are still looking into an issue with popups and IE 7
I have the same issue with project 13100. I noticed an error in the DOM-object (see image). Could this error be causing the problem? 
It seems that the problem only occurs when an event "Navigate to page" is added to a button. After removing all such events from the page which caused errors, it was able to preview this page. As soon a I added the event again I once again had the same problem.
Sorry for this problem, we are looking into this right now.
Also, I saw that you posted a feature request, but you posted it into a non-active 'exadel' community. Could you repost it in Tiggr community?
I have posted the feature request using the feedback option ("idea") which I started from the tiggr page https://gotiggr.com/public/login.seam.... It will repost it in Tiggr community.
Oops, we forgot to update the help widget on the home page to point to the right community.
Just an update.. this is a bug and we will fix it as soon as possible.
I will update here when it's fixed.