"Media Loading Error - Check your audio settings", Cross 1.5

Hi there,
i purchased a new PC alongside Windows 7 (64bit, Home Premium) last week, i had used WinXP before and had no trouble running Cross.
Here's a little more info about my system at first:
-CPU: Intel(R) Core(TM) i5 760 @ 2.80GHz
-RAM:8GB DDR3
-Audio: U46 MK2, M-Audio Delta Audiophile 2496
-Win7 Home Premium, 64bit
-Cross 1.5.0 (AudioCache:60%[2.46GB];Device: U46MK2[44.1kHz; Buffer size: 256]; Routing Mode: External Mixer)
-U46MK2 v3.0
Now my problem: Cross starts without any errors, but when i want to load a file into a deck the message "Media Loading Error - Can't load media: Check your audio settings." appears - this is not the case when i use the motherboards onboard audiochip(direct sound) or my delta 2496(with ASIO) or a single channel of the U46MK2 without ASIO. Using a channel of the U46 with direct sound allows loading files, but doesn't deliver a fluent signal because latency is at a record high.
The U46 is not used by any other application and i have checked everything i could think of and searching the support forum didn't return usable results.
I hope i haven't overlooked anything and this question isn't already answered in the forum.
Edit: Seems like i have overlooked some topics, but couldn't find help there either. My files are all MP3's, most of them encoded with 320kbps, resulting in file sizes between 6 and 16 MB.
Thanking you in anticipation.
Markus
i purchased a new PC alongside Windows 7 (64bit, Home Premium) last week, i had used WinXP before and had no trouble running Cross.
Here's a little more info about my system at first:
-CPU: Intel(R) Core(TM) i5 760 @ 2.80GHz
-RAM:8GB DDR3
-Audio: U46 MK2, M-Audio Delta Audiophile 2496
-Win7 Home Premium, 64bit
-Cross 1.5.0 (AudioCache:60%[2.46GB];Device: U46MK2[44.1kHz; Buffer size: 256]; Routing Mode: External Mixer)
-U46MK2 v3.0
Now my problem: Cross starts without any errors, but when i want to load a file into a deck the message "Media Loading Error - Can't load media: Check your audio settings." appears - this is not the case when i use the motherboards onboard audiochip(direct sound) or my delta 2496(with ASIO) or a single channel of the U46MK2 without ASIO. Using a channel of the U46 with direct sound allows loading files, but doesn't deliver a fluent signal because latency is at a record high.
The U46 is not used by any other application and i have checked everything i could think of and searching the support forum didn't return usable results.
I hope i haven't overlooked anything and this question isn't already answered in the forum.
Edit: Seems like i have overlooked some topics, but couldn't find help there either. My files are all MP3's, most of them encoded with 320kbps, resulting in file sizes between 6 and 16 MB.
Thanking you in anticipation.
Markus