I loaded SIG and All Videos based on the messages in Add New Item Image Gallery and Video tabs.  Video is working now but the same message remains for Image Gallery:

Notice: Please install JoomlaWorks Simple Image Gallery (Free/Pro) plugin if you want to use the image gallery features of K2!

It appears as if the system has recognized All Videos plug in but not SIG plug in.  I have checked to make sure that both are enabled.  Not sure what else to check or do.  Any help is appreciated.

I'm afraid that the free version of SIG is not yet compatible with K2 component. Only the Pro version is.

I have been struggling with the same problem for 2 full days trying to uninstalling and re-installing the plugins and components!!

WHY does it say you can use PRO and FREE version when thats not the case ( SIG with K2) ...!!??
That is really unprofessional!! I really like your components, and was looking forward to start using them, but after using 2 full days with this problem just to find out
that it was a complete waist of time and "misleading" information..
I wouldn´t have had any problem paying for it, if it wasn´t for the fact that I just spent 2 days trying to figure out what was wrong with my site.. Why do you say you can use both when that´s not the case..?

You just lost several clients

regards,
Robert Hansen

I am having the same problem but I've purchase the Pro version and have installed it and K2 still doesn't see it. The plugin is enabled.

Any clues as to why this happening and possible solutions?

Please install the latest K2 and SIG PRO versions in order to solve your problem.