I am having this issue as well. I've installed the extension on a server from a different provider with no issues. I was told to post on the forums after opening a support ticket. Like takram, typing "sm exts list" into console gives this:
[10] <FAILED> file "curl.ext.dll": The application has ...
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- Fri Dec 20, 2013 7:17 am
- Forum: CS:Source/TF2/DoD:Source
- Topic: Sourcemod Extension Fails to Load
- Replies: 1
- Views: 3574