Create a new writer document, insert a table of any size but with at least 2 columns.

Now place your mouse pointer arrow on any vertical border of the table: the pointer changes, showing a couple of horizontal arrows in opposing direction, suggesting you can now drag the border and change the columns width.

However this is now completely IMPOSSIBLE: as soon as you click the mouse to start dragging, the pointer goes back to normal and the border is not affected at all.
I have tried dozens of times at all zoom levels, border sizes, etc. to no avail.

Until LO4.4, change of columns width by dragging vertical borders was working well and was quick and easy to perform.

Without this functionality, Writer tables are almost unusable, since changing their columns width numerically via the dialog window is not really feasible in practice, and having only tables with equally spaced columns is just as unpractical.

For those often using tables in Writer docs (me amongst them), I am afraid this could be reason enough to downgrade until it is fixed.
Thanks for the attention