Error on launch

Got an error I’ve never seen before. On launching the client, I got:

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Details
Application Error

Exception caught in: System

Error Detail 
============
Message: The system cannot find the path specified
Program: System.dll
Method: CreateDirectory

Client Stack Trace 
==================
   at Microsoft.Win32.NativeMethods.CreateDirectory(String path, SafeLocalMemHandle acl)
   at System.CodeDom.Compiler.TempFileCollection.CreateTempDirectoryWithAce(String directory, String identity)
   at System.CodeDom.Compiler.TempFileCollection.GetTempFileName(String tempDir)
   at System.CodeDom.Compiler.TempFileCollection.EnsureTempNameCreated()
   at System.CodeDom.Compiler.TempFileCollection.AddExtension(String fileExtension, Boolean keepFile)
   at System.CodeDom.Compiler.TempFileCollection.AddExtension(String fileExtension)
   at System.CodeDom.Compiler.CodeCompiler.FromSourceBatch(CompilerParameters options, String[] sources)
   at System.CodeDom.Compiler.CodeCompiler.System.CodeDom.Compiler.ICodeCompiler.CompileAssemblyFromSourceBatch(CompilerParameters options, String[] sources)
   at System.CodeDom.Compiler.CodeDomProvider.CompileAssemblyFromSource(CompilerParameters options, String[] sources)
   at Ice.Lib.Customization.CustomScriptManager.BuildCustomAssembly(String filePath, CodeDomProvider codeProvider, CompilerParameters parameters, String source, String& sourceFileName)
   at Ice.Lib.Customization.CustomScriptManager.CompileCustomScript(Boolean loading)

This appears after the main window appears, and with “Downloading from Database” is in the little status window.

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Clicking OK clears the message, but the error pops up when opening other forms.

After closing the client and relaunching it, the error still appears.

Anything to be concerned about?

Logging out and then back in, on the workstation, fixed it.