Selling chest won't work. After first buying then selling with chest, selling chest stop working and selling in inventory too.
Sorry for my English :)

can't reproduce

if this problem persists, consider sending me your save game

Here is my test save file:
https://drive.google.com/file/d/1KBAZfuJwC4H5V3ct3Nhp0c6FqIrz2P7M/view?usp=sharing

In first selling is working. But, when I buy any item with chest then change for selling, the selling don't work anymore except for raw ores and wood. I downloaded new factorio zip and added only your mods.

It happens roughly 3 hours 30 minutes into a save game for me, usually closer to 3 hours 50 mins
i used performance mode and a max recipe depth of 55

Market 0.18.31 working correctly :)

...

in the save you sent me everything works perfectly, i also tried switching to buying, with or without actually buying some stuff and switching back to selling, just can't manage to break it.

please send me a save where it already doesn't work.

Sorry I send you save file on 0.18.31 where everything is working. Here is save from latest 0.18.33. After load you must by something from chest then change it to sell. Selling is working only on base items like ores and wood. Every other item is not sellable.
https://drive.google.com/file/d/1NgR-IplurkUx7PHyC_0bwqo1St3FzKUB/view?usp=sharing

nope.. still can't reproduce.
can you send a save game where it already doesn't work please?

Apparently when you by ores. Let's say you by iron ore then switch to selling. Try then to sell plates for example.
I can't send you file with bug because when you load a save everything is working.

ahh now we're talking :) i'll figure out a fix

I managed to reproduce bug. Here is save link
https://drive.google.com/open?id=1m84VxXyIINIOXCDQ7WCBpuFhB61563iD
Also I noticed massive energy spikes when chest are used. Is there a way to reduce energy cost or to turn off?

fixed :)

on 0.18.31 everything is working correctly if that helps. Thank you for your response :)

thank you very much :)