Split Size Disabled

[jscooper22]

Hi,

I'm trying this out the first time and testing it on two different systems. For some reason, on one machine the option to split an archive into pieces is enabled but on another it's dimmed. All options seem the same (except the one on which is it's working is going on a giant (15TB free space) external drive. On the other I'm just going into a folder on my desktop.

Is there some option I accidentally click or should I just clear the preferences and start over?

Thanks,

Jeff