When evaluating the new Mathematica 12 functionality, I came across the following issues with this simple expression:

Excessive times required for "Formatting Notebook Contents"

• The "Formatting Notebook Contents" when opening a notebook with the above mentioned expression will take about 25 sec on my machine.
• Evaluating the expression will take another 30 sec of formatting contents.

Mathematica 12 crash

the following expressions will consistently crash Mathematica 12 on my machine:

data // TableForm

When I click Uniconize from the expression

Iconize[data, "Country Data"]

will crash Mathematica too.

This will crash Mathematica 12

data[[All, {2, 3}]]

However, this will not:

ListLogLogPlot@data[[All, {2, 3}]]

Mathematica 12 was installed after I uninstalled version 11.3 on my Windows 10 Pro 17763.437 machine.

Anyone else experience something (or exactly the same) issues? Are there any work-arounds?

Cheers,

Dave