payment gateway settings aren't showing up in the pop-up window.

Hi Wpmu dev.

at [protect content] -[setting]-[payment]-[edit ( of each payment)] or[configure], nothing are shown in the pop-up window but the title of box as"window".

is it a conflict with other plugins?
pls give me advice!

this is a screen shot below.
http://jppm.jp/wp-content/uploads/2015/04/%E3%82%B9%E3%82%AF%E3%83%AA%E3%83%BC%E3%83%B3%E3%82%B7%E3%83%A7%E3%83%83%E3%83%88-2015-04-27-16.28.002.png

Best regards.