Emulator

What's the problem?
Everytime I want to open the Super Smash Bros. Brawl, it says: "Please insert the Super Smash Bros. Brawl Game Disc." and the game locks. Here's screenshot: http://imgur.com/jebAg . I have complettely no idea what revision has glitched The Game, because I didn't play it for a while, but I'm 100% sure that I was able to run the same .gcz file before (4 stars rating proves it).

Dolphin version with the problem (as it appears in the title bar, Ex.: "R
4779" or "R 6403M"):
r7477

(optional) Dolphin version that does not have the problem:
Again, no idea.

Operating system and version:
32-bit or 64-bit:
32-bit.

Game ID (as it appears in game properties, Ex.: "GZ2P01" or "RSBE01"):
RSBE01 (Super Smash Bros Brawl NA)

Was the ISO a plain dump from disc, compressed and/or scrubbed?
Compressed (.gcz)

Please provide any additional information below.
Windows 7 x86
AMD Athlon II X2 240
2.81 GHZ
Nvidia GeForce GT 240 v267.24
OpenGL
DSP HLE and DSP LLE
Settings: Dual Core, Idle Skipping, JIT recompiler, Autotrolling, SD card, no Wii Menu, Native Mipmaps, CPU for EFB, Texture Copy, Safe Cache, OpenCL, OpenMP.