Update: The problem seems to be fixed now! As I could not get hold of a Windows laptop today, I tried 2 things this morning: (1) I first switched the Meteobridge Pro to "Use internal RF receiver" (i.e., to not use the WeatherLinkIP device). This did not fix the problem, so (2) I also rebooted the Davis VP2 console (power-cycle). The second action seems to have fixed the problem (see attached image; I hope the jagged barometer line will eventually become smooth).
I will wait for a few hours, and then I will switch the Meteobridge Pro back to reading from the WeatherLinkIP device [@Mattk the WL upload interval was set to 1 minute]. It is possible (I guess) that the problem was fixed solely by the rebooting of the console and the WLIP -- I will know for sure by tonight.
Thanks,
chrysnic