Problem Details:
After an update around a week ago, osu! tells me that I'm running fallback mode. Just few hours ago, I press "that" button and wait it updating again. After restaring, the only thing I got is blank screen. The game seems just fine, just the screen just got black. I can click the "osu" on middle, but nothing happen for the view.

I'm running an old machine, Compaq Presario CQ40. Here's the spec. OS Windows XP SP3.

Anyone has the solution?
I recall that we could change the version we run just by edit a file, but I forgot which one it is.

Video or screenshot showing the problem:
- total blank screen


osu! version: 20151016.7


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I try to open the "osu!.cfg" and this what I see

u_UpdaterAutoStart = 0
u_UpdaterTestBuild = 0
_ReleaseStream = Stable40
_UpdateFailCount = 0
h_osu!.exe = 342b63562dea199f44f99e615366f88e
h_avcodec-51.dll = 734e450dd85c16d62c1844f10c6203c0
h_avformat-52.dll = 9c492c0792c4302b4ffaf5f27e48c443
h_avutil-49.dll = 8462c4461db36bc03392ee9576e3d34e
h_bass.dll = d7f05d3fa5e745e02e1de41821ccccaf
h_bass_fx.dll = ede8b6bfd91068ee477e1b6cd438cd0c
h_d3dx9_31.dll = eea5e428ce63804f9b12d21c97b5968f
h_Microsoft.Ink.dll = 340a75fd6e365fc85cfbd04ae295fa28
h_Microsoft.Xna.Framework.dll = d6473fe53bd299e8bd1fa55e92f21d4a
h_osu!ui.dll = 8cea395993d9a2d62b10982ae39d454d
h_osu.dll = c400362e88d44b45cd4b019235f95ffd
h_pthreadGC2.dll = 1d5ab200f8d19cd9e65eb06ccdf6d59a
h_x3daudio1_1.dll = 121b131eaa369d8f58dacc5c39a77d80
h_osu!gameplay.dll = 1eb9621a77bb0ca5200d87523e4085b2
h_OpenTK.dll = 89e4e9b5b57dc202474fa5156aa9b482
h_d3dcompiler_47.dll = c5b362bce86bb0ad3149c4540201331d
h_libEGL.dll = 6f9c2f2ada74fb0db641bc91175c09df
h_libGLESv2.dll = 596c8bee5ec8f7a1948e73d9c9945535

Hold Shift while opening osu! and don't release it until a config window pops up, enable an option named "Compatibility mode" and the click on start osu!. Your other option is to do the same to open the config window, select Stable (Fallback) in the Release stream menu and then click on repair osu!.

Trosk- wrote:

Hold Shift while opening osu! and don't release it until a config window pops up, enable an option named "Compatibility mode" and the click on start osu!. Your other option is to do the same to open the config window, select Stable (Fallback) in the Release stream menu and then click on repair osu!.

thanks a lot, it really worked!