phoebus probe display question

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hi, all:

When I use phoebus, I met a very strange problem. That is, I use probe to monitor a PV (for example, test:ai1 from makeBaseApp's example IOC), it can be monitored and changed normally. But when I chose probe display by right click, it can’t display the plot curve, just blank area. 
The OS is ubuntu 22.04, phoebus 4.6.4 or 4.7.
How to find the reason? Thanks a lot for your help.


Geyang
Best wishes

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