CRM 2011 Cannot Import Solutions

Running CRM 2011 On-Premise, when attempting to import either managed or un-managed solutions, the screen just sits with no progress forever:
Import screen
Windows event viewer shows the following event:

   Not available
  InternalOperationPlugin: Could not find method 'ImportSolutionSkipCapable' on 'Microsoft.Crm.WebServices.ImportXmlService'.;Hash='1595594188'

Have Googled this error but everything I've found has dealt with CRM4.0 not 2011 and no real solution

Any help would be appreciated

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BrianFordConnect With a Mentor Author Commented:
I've opened a case with MS
Feridun KadirPrincipal ConsultantCommented:
Which update rollup do you have installed?
BrianFordAuthor Commented:
Rollup 8, for various reasons I cannot install any later roll-ups at this time.

However, I have imported solutions to this instance in teh past, the last one was just 2 weeks ago and no problems at all
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Feridun KadirPrincipal ConsultantCommented:
Hmm.  I'm not sure that I have an answer for you. Things I would check:

Do you think installing UR8 caused the problem?  
Has anything else changed?
Is everything working in IIS for the CRM web site?
Have you recently restarted the CRM server?
Can you check on a test system?
BrianFordAuthor Commented:
I don't think it's RU 8, we've had that installed for quire some time and it's worked just fine up to about 2 weeks ago

Nothing elkse changed to my knowledge
IIS is working fine for the CRM site
I just re-started the server anout an hour ago and it did not fix the problem :(

Our test system is working just fine, with RU8
Feridun KadirPrincipal ConsultantCommented:
Perhaps another update to the server via Windows update has caused the issue.

I think you may well have to contact Microsoft product support on this one.
Feridun KadirPrincipal ConsultantCommented:
Thanks for letting me know. If you don't mind posting, I'd be interested in the resolution.
BrianFordAuthor Commented:
Certainly, hopefully I will get one :)
BrianFordAuthor Commented:
was resolved by Microsoft Support
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