I find that the delete link in the conditional moves box is unreliable. Sometimes it works; at other times it does not. 

Is there a surefire way to delete a conditional move?

I find the delete button is very unreliable at times, like you, however it is the only way to delete lines, and if you click it enough, it will eventually delete the line.

I've lost a game over this too.  Therefore I have determined that the surefire way to delete a conditional move is not to make one.

I've been using Chrome as my browser and that's the only time the delete button didn't work for me.  I switched over to Firefox and was able to delete my condition.

Could be the problem with me also as I too use Chrome mostly. Shall try Firefox. Thanks for the hint.

Wow...I had the opposite problem?  It worked fine, then I got the latest Firefox update...suddenly I coudn't delete conditionals, use game explorer and other features...so I switched to Chrome and have no problems.  This internet is one wacky world.  Did anyone else have a problem with Firefox recently?

I just did a trial with Firefox, latest version, and delete worked fine.

Actually it is a combination of factors such as the browser, version, actions enabled and disabled, and so on that determines what you can do and cannot, I think.

Brilliant...it's the browser!  I too was using Chrome...

I am using internet explorer and I have no problems deleting conditional lines.  :)

I too...

I am using internet explorer and I have no problems for deleting a conditional move line

Using IE. No problem yet.