What worked for me, cumbersomely, is this: Copy table from HTML file. Paste normally into Evernote. Right-click anywhere in the table and choose Upgrade Table. Manually adust the column widths. This is not acceptable. Until now, I could directly paste from HTML tables into Evernote without need for reformatting.
In past I can copy tables on HTML pages and paste into Evernote client for Windows. No problem. Now, suddenly, the pasted text gets arranged by Evernote in very skinny columns, with no table borders. How to fix? Older notes with pasted-in tables still look fine.