Tested v18.0.2254.106121 - still the same issues as reported earlier, plus some new issues
previous issue - if there are two drop-down menu's on a webpage in which the second displays an array based on the first, the page does not refresh after the first drop-down is chosen (as it did in versions before v.18), thus the second has no array to display - this is with data savings turned on (turning Data Savings off results in extremely long page loading on sim-card / Edge standard, 45 sec - over a minute, or, like any other browser).
However, now there are several new problems:
websites are just not accessible by sim card, i.e. weak connection unless Data Savings is turned on (just displays 'Unable to connect')
Turning Data Savings off, now nullifies 'Single Column View', yet the Single Column View box is checked (again, resulting in full page loading and the very long page load times mentioned above).
Testing conditions:
all versions of Android (4.4, 5.1, 6.0.1)
Opera AdBlock turned on and off
Hope this feedback helps,
Mike