diff -uar truecrypt-6.3a-source.orig/Core/Unix/Linux/CoreLinux.cpp truecrypt-6.3a-source/Core/Unix/Linux/CoreLinux.cpp
--- truecrypt-6.3a-source.orig/Core/Unix/Linux/CoreLinux.cpp	2009-11-22 16:09:54.000000000 +0100
+++ truecrypt-6.3a-source/Core/Unix/Linux/CoreLinux.cpp	2010-04-04 16:47:42.000000000 +0200
@@ -90,13 +90,23 @@
 	void CoreLinux::DetachLoopDevice (const DevicePath &devicePath) const
 	{
 		list <string> args;
+		list <string> args2;
 		args.push_back ("-d");
 		args.push_back (devicePath);
+		/* args2 needed to umount loop device before detaching it
+		 * by Enrico Lo Tauro (neongen)
+		 */
+		args2.push_back (devicePath);
 
 		for (int t = 0; true; t++)
 		{
 			try
 			{
+				try
+				{
+					Process::Execute ("umount", args2);
+				}
+				catch (ExecutedProcessFailed&) { }
 				Process::Execute ("losetup", args);
 				break;
 			}