ckfinder do not work in the new Versions of opera (since Version 10.52). You can see this error also on your demo site.
The error console of opera says:
JavaScript - http://ckfinder.com/apps/ckfinder/1.4.3 ... files.html
Uncaught exception: TypeError: Cannot convert 'this.aS' to object
Error thrown at line 43, column 5681 in <anonymous function: d.dm>() in http://ckfinder.com/apps/ckfinder/1.4.3 ... r_gecko.js:
this.aS.eg.bK();
called from line 43, column 5859 in <anonymous function: d.fK>() in http://ckfinder.com/apps/ckfinder/1.4.3 ... r_gecko.js:
this.dm();
called from line 43, column 226 in <anonymous function: Refresh>(A) in http://ckfinder.com/apps/ckfinder/1.4.3 ... r_gecko.js:
this.fK();
called from line 43, column 27192 in bn(A, B) in http://ckfinder.com/apps/ckfinder/1.4.3 ... r_gecko.js:
d.Refresh();
called from line 24, column 528 in dk(A) in http://ckfinder.com/apps/ckfinder/1.4.3 ... r_gecko.js:
B.bo(B,A);
called from line 23, column 3380 in cU(A, B) in http://ckfinder.com/apps/ckfinder/1.4.3 ... r_gecko.js:
B.OnClick(B);
called via Function.prototype.apply() from unknown location in <anonymous function: l.ad>(e) in http://ckfinder.com/apps/ckfinder/1.4.3 ... r_gecko.js:
/* no source available */
Sat, 05/01/2010 - 11:11
#1