I am running Origin7.5 on a linux machine using Xover Office 5.0. When i try to export a Plot to .eps format i do only see the Plot itself (and the legend) but the title and the both lines describing the axes are missing. This error does not occour usind windows.
I can confirm this error, but I do not know any solution :-( I solved it by printing to a file and then removing the /showpage command. Actually, not all EPS (and PDF) had this problem, sometimes some labels (or even all) outside worked. If I recall correctly, playing around with the options did not help.
Using the current nightly build of CXO 5, all EPS/PDF I quickly tried worked. Thus you should try updating to CXO 5.0.1 after it had been released (should be a matter of weeks).