Small (i hope so) bug inside NagVis again. If you embed an iFrame from CMK or somewhere else.
Easy example is a dashboard with graphs like in this post.
It is not possible to resize the shown frame after the creation and you cannot open the options of this element. If you use the function “unlock all elements” you can start to resize the element but your mouse will stick to the selected edge and you cannot finish the resize.
Only option to modify such an iFrame is on the command line inside the config file.