I experienced a very strange behavior today in KNIME Analytics Platform (version 5.8.1 LTS).
Sometimes (not all the time) when I click on a node (to inspect its configuration) or select a few nodes (e. g. to copy them) they simply disappear.
No matter, what I do, they don’t reappear. Zooming in, out, to 100%, activating the pan mode (hand icon), click on the mapping icon. I have to close the application and reopen it (which - with all due respect is pretty annoying).
I have provided a GIF of this strange behavior:
Hey @kowisoft ,
I think I read about this before and pretty sure that is a bug in the new WebGL rendering.
I think current workaround is to switch back to SVG Rendering:
Should not be an issue as long as you are not dealing with massive workflows…
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Thanks a lot for your kind help, Martin. That did the trick. Good to know, I probably would never have looked there.
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(neither should you have to look there - better to just work…)
Am unsure whether this has been fixed in a later version - saw you are on 5.8.1 LTS - think that got bumped up to 5.8.3 and STS I think is up to 5.11.
But I take it will take a while for you (or your IT 
) to move that up…
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so true. We’re glad we ‘made it’ to 5.8.1 
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Hey,
Did you maybe notice some patterns that you did when this happens?
As @MartinDDDD rightfully mentioned this is likely a problem with the WebGL rendering. We improved and fixed a lot of things on the WebGL rendering since 5.8.1, but its hard to pinpoint it as long as we are unable to reliably reproduce.
Greetings and thanks,
Daniel
unfortunately not. Other than “clicking” and “selecting” I really didn’t know what repeatable pattern of actions I did.
But probably this doesn’t matter anyways, as I do not plan to update from 5.8.1 anytime soon (due to company policies).
Makes sense. Sticking to SVG instead of the WebGL renderer in this case should solve your problem.
Greetings,
Daniel
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As I am “fighting” with workflow invocation as well those workflows hopefully do not become to big.
Just recently told a colleague the 3rd commandment by KNIME: Thou shall not build too messy workflows
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