Please install this version.
For licensed users upgrades are free for up to six months from purchase date. After that, VP will continue to fully function but a fee will be required in order to register the newest. Retain your old install file and registration info.
A blue line? Please link a screenshot. Upload it to a server, share the link and post that here.
The green and grey lines above the thumbnails indicate the state of sequence and preview caching. When they complete, play should be smooth.