[Ifeffit] ATHENA on Ubuntu

Dear All, I ve installed ifeffit on my ubuntu desktop. I try to load it and apparently faster than in my windows desktop. The problem is, when i have selected the EXAFS data file in athena data column, i could not find the OK button in the lower left part of the window so i could not continue to work. Does anybody have solution for this ? Thank you very much Andi Villigen