This is not specific to PTP RC1 it also occurs with PTP beta 2.
Scenario is where you have an image specified as the Link/Object for a hotspot and an Info bubble specified for the hotspot. (Screenshot 1)
In the screenshots below I have used a custom image as the hotspot Display/Object for the hotspot but that's not relevant and the anomaly occurs if instead I use one of the theme hotspot graphics.
When you hover-over the hotspot then the Info bubble text is displayed - so far so good. (Screenshot 2).
If you click on the hotspot it opens the Link/Object image - as expected.
BUT...when you hover-over the Display/Object image then the hotspot Info bubble text is displayed - not what I would have expected (Screenshot 3). It is as if the Link/Object has 'inherited' the Info bubble text.
You can also see this Info bubble text display anomaly in this on-line tour (not mine):http://motionart.com.mx/rocio/rocio_borobia/exposicion.html
Go into the exhibition area where each art piece has a hotspot, with Info bubble text, that is linked to a larger head-on image of the art piece. Note that the Info bubble text is displayed when hovering-over the linked pop-up image, as well as when hovering over the hotspot.