Bug with iw

I am using XE2 iw and tried to upgrade my intraweb tms component pack from 4.9 to 5.0.  I get the following error when I click on a tiwbutton that updates an underlying dataset and tiweditbox on the screen.

Please fix this your 5.1 version looks like something I need to use.
Webpage error details

User Agent: Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.1; WOW64; Trident/4.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0; .NET4.0C; .NET CLR 1.1.4322; InfoPath.3; .NET4.0E)
Timestamp: Thu, 24 May 2012 16:59:34 UTC

Message: 'document.getElementById(...)' is null or not an object
Line: 5
Char: 8187
Code: 0
URI: https://helpdesk2.ccok.com/webdesk_helpdesk.dll/$/js/IWAjax__EC75161EB.js

What specific TMS IntraWeb components are you using?
TIWButton, TIWEditBox are not TMS components.

The TMS components that are also on that part of the program are

1.  ttiwdbadvedit
2.  ttiwdbdatepicker
I did find it strange that I was clicking on a tiwbutton and just trying to update a field in a dataset and an tiwedit box.
Anyway, with TMS 4.9 everything works like a charm.
Let me know if you need anything else.

You mention your problem is about updating a dataset with a TIWButton from a TIWEditBox.
I can't see a relationship between this and our components. It is not clear what code you use either.
If the problem is really in our components (try to see first if the problem persists if you remove our components), then please provide some working sample source project with which we can reproduce & investigate the problem.