This has happened to a colleague of mine: when trying to open a solution file with VS 2010 the program would start, it would successfully load the solution, open the few files that were open when last closed, then suddenly restart. No fancy dialog prompting for action, no message of any kind, just a total silent fail. He tried using the /log filename option of Visual Studio to gather more information, it did not help. He tried using the /SafeMode switch to load only the essential bits of Visual Studio, to no avail. The only useful information was in the Windows Application log (run eventvwr.exe in the command line) which pointed to the module cslangsvc.dll failing.

The Windows Application log entry for the crash:
Faulting application name: devenv.exe, version: 10.0.40219.1, time stamp: 0x4d5f2a73
Faulting module name: cslangsvc.dll, version: 10.0.40219.1, time stamp: 0x4d5f3b95
Exception code: 0xc0000005
Fault offset: 0x00249be1
Faulting process id: 0x1af8
Faulting application start time: 0x01ce3c253d1db9e5
Faulting application path: C:\Program Files (x86)\Microsoft Visual Studio 10.0\Common7\IDE\devenv.exe
Faulting module path: C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC#\VCSPackages\cslangsvc.dll
Report Id: f3522e88-a818-11e2-a285-14109fd5a416

The bit of the Visual Studio log that is relevant:
<time>2013/04/18 11:17:35.042</time>
<description>Unexpected system error mode before loading package [Visual Studio XML Editor Package]</description>

At this point, we thought that it was a problem caused by Visual Studio trying to parse the open files, probably related to Intellisense, which means we need to make the solution open ignoring the files open when using it last time. That means deleting the file with the .suo extension associated to the solution.

This is a common issue, as the first Google search item when looking for cslangsvc.dll is this: Visual Studio 2010 Crashing on Solution Load. The thing is the guy does claim he deleted his .suo file and that the problem was still reproducing. There are also some Microsoft Connect items logged (Vs2010 crashes on cslangsvc.dll) that have no resolution.

Well, deleting the .suo file associated with the solution worked. This, of course, removes more than the last opened files, like the source control associations of the solution, various custom options for said solution, etc, but it shouldn't be a problem.

There is a bit of information in the Visual Studio log which points to the XML Editor Package. This means it could be caused by XML files or aspx/ascx files. However, it might not. We did not pursue the issue any further. Hope it helps other people looking for a resolution.


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