Problem with tags/Thumbs (1 Viewer)

[mamachan]

MediaPortal Version: 0.2.3.0 stable
MediaPortal Skin: Monochrome
Windows Version: XP Sp2
CPU Type: Core 2 Duo E6400
HDD: Samsung 250GB + 2 x Samsung 500GB
Memory: 2048 DDR2 Dual Channel 800 Mhz
Motherboard: Asus P5B Deluxe WiFi AP
Video Card: Nvidia 7600GS
Video Card Driver: 163.75
Sound Card: Theatron Agrippa DTS 7.1 (= Auzentech X-Plosion DTS 7.1)

Goodmorning,
i have this problem with tags/thumbs.
I tagged 2 my music CD in this way:

TAG Album: Super Sanremo 2008 CD1 (for the first CD)
and
TAG Album: Super Sanremo 2008 CD2 (for the second CD)

All thumbs are created but MP don't use it (no thumbs are displayed).
If i delete CD1 and CD2 tag's informations, ALL WORKS FINE

Is a bugs or is regular

Thanks
massimo