Error for the past few days when trying to run trajectory

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Error for the past few days when trying to run trajectory

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Since here is code contributor, I would like to use this to ask what means thick line in level and then thiner when looking at trajectory?

Thank you

@Suty sorry for late reply

https://prnt.sc/gD_xLgylrKaO

hmm .. just tested - works well in FF - Chrome is without background

@Suty i use desktop version on my Windows 10 comp.

From last week menu background on desktop is transparent ... any idea?