|DSP features on the Maui WebSDR
"I reloaded the page, but DSP noise reduction (or related option) suddenly isn't working"
There's a quirk related to the "tick" boxes and drop-down settings on the WebSDR - and other similar boxes on other web pages and that is that if you reload or refresh the web page, the boxes or selections may look as though they are active, but they will not be.
For example: If you were to select a DSP setting of Low, the DSP noise reduction would start working - but if you refreshed the page, it may still show that selection, but the DSP noise reduction would not be active.
The work-around is to select Off (or any other setting than the current one) and then select Low again to reinstate the filter.