I got into this problem recently, initial thought is that its caused by some missing assemblies. But after removing all solutions from the server, the problem still persist. Yes, from SharePoint Designer I can see the allitems.aspx. My gut feel is that it has something to do with the permission issue on the managed account assigned to the web application. So what I did was to create a new managed account for this web application and things back to normal. So I hope it helps as this seems to be a common problem but exists in different forms.
I shared about Office 365 features and integration with Office for mobile devices
Go here to download my slides http://1drv.ms/1oJuVwx
Just found out today Packt Publishing is celebrating its 10 years anniversary and offering a special price of $10 per book for their customers for duration of 10 days! For SharePoint folks, Microsoft SharePoint 2013 Disaster Recovery Guide got a 5-star ranking on Amazon (But head back to Packt to enjoy the discount). Now this book is only $10 so hit the link below to find out more~!
If you are running SharePoint 2013 on SQL Server 2012 SP1, you will see funny characters like the picture below inside Site Settings.
The solution would be just go to download SQL Server 2012 SP1 Reporting Services Add-in for Microsoft® SharePoint at this URL http://www.microsoft.com/en-us/download/details.aspx?id=35583
And you will see the proper labels displayed
When I upgraded a site collection to version 2013 recently, I notice all the pages with custom page layout cannot be edited anymore. We did a test run on our local SharePoint site with the same content but didn’t run into this problem.
One thing pretty funny is, all SharePointers will know that SharePoint 2013 assemblies are version 15. But I noticed the version of custom page layouts on my SharePoint Online site are now version 126.96.36.199. I checked the version of my SharePoint Online site by navigating to https://myspsite.sharepoint.com/_vti_pvt/service.cnf and it shows also version 188.8.131.529
We have not find the solution to this, so wait for further posts on how to fix this.
Update: 1 day later, the site where the pages cannot be updated works perfectly without me doing anything. Could it because SharePoint Online migration actually will take a longer time beyond the ‘OK’ status.