I've been making a map recently, and I didn't have any problems compiling for a while, but it stopped compiling properly. It started to not compile some things, as in it would compile world brushes but changes to entities or changes to brushes tied to entities (for example changing the texture on a button) wouldn't show up in the compiled map. Now it won't compile anything.
This is the compile log I'm getting:

** Executing...
** Command: "c:\program files (x86)\steam\steamapps\alabastor_twob\sourcesdk\bin\orangebox\bin\vbsp.exe"
** Parameters: -game "c:\program files (x86)\steam\steamapps\alabastor_twob\half-life 2 episode two\ep2" "C:\Program Files (x86)\Steam\steamapps\alabastor_twob\sourcesdk\bin\orangebox\bin\maps\mankauff_house\fancy_ass_house.vmf"

Valve Software - vbsp.exe (May 7 2010)
2 threads

** Executing...
** Command: "c:\program files (x86)\steam\steamapps\alabastor_twob\sourcesdk\bin\orangebox\bin\vvis.exe"
** Parameters: -game "c:\program files (x86)\steam\steamapps\alabastor_twob\half-life 2 episode two\ep2" "C:\Program Files (x86)\Steam\steamapps\alabastor_twob\sourcesdk\bin\orangebox\bin\maps\mankauff_house\fancy_ass_house"

Valve Software - vvis.exe (May 7 2010)
2 threads
reading c:\program files (x86)\steam\steamapps\alabastor_twob\sourcesdk\bin\orangebox\bin\maps\mankauff_house\fancy_ass_house.bsp
Error opening c:\program files (x86)\steam\steamapps\alabastor_twob\sourcesdk\bin\orangebox\bin\maps\mankauff_house\fancy_ass_house.bsp

** Executing...
** Command: "c:\program files (x86)\steam\steamapps\alabastor_twob\sourcesdk\bin\orangebox\bin\vrad.exe"
** Parameters: -game "c:\program files (x86)\steam\steamapps\alabastor_twob\half-life 2 episode two\ep2" "C:\Program Files (x86)\Steam\steamapps\alabastor_twob\sourcesdk\bin\orangebox\bin\maps\mankauff_house\fancy_ass_house"

Valve Software - vrad.exe SSE (May 7 2010) 
Valve Radiosity Simulator
2 threads
[Reading texlights from 'lights.rad']
[48 texlights parsed from 'lights.rad']

Loading c:\program files (x86)\steam\steamapps\alabastor_twob\sourcesdk\bin\orangebox\bin\maps\mankauff_house\fancy_ass_house.bsp
Error opening c:\program files (x86)\steam\steamapps\alabastor_twob\sourcesdk\bin\orangebox\bin\maps\mankauff_house\fancy_ass_house.bsp

** Executing...
** Command: Copy File
** Parameters: "C:\Program Files (x86)\Steam\steamapps\alabastor_twob\sourcesdk\bin\orangebox\bin\maps\mankauff_house\fancy_ass_house.bsp" "c:\program files (x86)\steam\steamapps\alabastor_twob\half-life 2 episode two\ep2\maps\fancy_ass_house.bsp"

The command failed. Windows reported the error:
"The system cannot find the file specified."

I didn't change any compile settings, it just began to do this by itself.
I've been using Source Engine 2009, but I tried it with 2007 and that won't work either.

[Edit] It somehow fixed itself. I don't know how it did, but I'm probably going to end up reinstalling the SDK. I don't like the way it's changing how it works.