Exchange 2010 SP3 Update Rollup 6 breaks first OWA login (timezone selection) on SBS 2011

The Exchange 2010 SP3 Update Rollup 6 broke the OWA for Users who access OWA for the first time and have to set a timezone. They get this error:
Request
Url: https://xxxxx:443/owa/languageselection.aspx
User: xxxxxx
EX Address: /o=First Organization/ou=Exchange Administrative Group (FYDIBOHF23SPDLT)/cn=Recipients/cn=xxxxx
SMTP Address: xxxxxx
OWA version: 14.3.195.1
Exception
Exception type: System.ArgumentNullException
Exception message: Value cannot be null. Parameter name: value
Call stack
Microsoft.Exchange.Clients.Owa.Core.Utilities.RenderDirectionEnhancedValue(TextWriter output, String value, Boolean isRtl)
Microsoft.Exchange.Clients.Owa.Core.LanguageSelection.RenderTimeZoneSelection()
ASP.languageselection_aspx.__Render__control1(HtmlTextWriter __w, Control parameterContainer)
System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children)
System.Web.UI.Page.Render(HtmlTextWriter writer)
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)
This Server is an SBS2011.
The update broke nothing on a "normal" 2008R2 with exchange 2010.
Uninstalling RU6 helped but thats obviously not the desired way.
Removing the RenderTimeZoneSelection() call from languageselection.aspx obviously helped but then there is no timezone dropdown displayed anymore. The timezone dropdown is working normaly in other places like ecp. Afaik this error occours only in the languageselection.aspx
file which is displayed for "new" OWA users. (Users without a timezone set)
my workaround was to set the language and timezone for these mailboxes via exchange shell.

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Thank you for your post.
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