If you have updated to Chrome version 42 or higherIn Chrome, type the following address in the address field:
chrome://flags/#enable-npapiDon't worry about this warning:
Find and click the link to Enable NPAPI.
|This image shows you how far down on the screen you will find it|
Click the blue Enable text link.
Quit and relaunch Chrome and you will be able to use Design Space again.
If you do not see the Enable NPAPI option, you are not using Chrome version 42 and Design Space is not affected.