Closing OMM after running out of Mod Organizer

[OH72]

After several runs without a problem, suddenly OMM is giving me an error about not finding part of a path.

Crashdump is in German:

Donnerstag, 6. Juli 2017 - 03:46:11

1.1.12 (Safe mode)

OS version: Microsoft Windows NT 6.2.9200.0

Type: System.IO.DirectoryNotFoundException

Error message: Ein Teil des Pfades "D:\SteamLibrary\steamapps\common\Oblivion\data\INI Tweaks" konnte nicht gefunden werden.

Stack trace: bei System.IO.__Error.WinIOError(Int32 errorCode, String maybeFullPath)

bei System.IO.Directory.DeleteHelper(String fullPath, String userPath, Boolean recursive)

bei System.IO.Directory.Delete(String fullPath, String userPath, Boolean recursive)

bei System.IO.DirectoryInfo.Delete()

bei OblivionModManager.MainForm.TidyDataFolder()

bei OblivionModManager.MainForm.MainForm_FormClosing(Object sender, FormClosingEventArgs e)

bei System.Windows.Forms.Form.OnFormClosing(FormClosingEventArgs e)

bei System.Windows.Forms.Form.WmClose(Message& m)

bei System.Windows.Forms.Form.WndProc(Message& m)

bei System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)

bei System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)

bei System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)

As a consequence, OMM doesn't close and has to be killed with the Task Manager

Any idea why this suddenly started?

As one possible clue, I have the impression that archive invalidation doesn't work properly.