Just updated and the game crashes when using the copy function (in this case on a line of 4 red belts), this wasnt in a warehouse but in the overworld.
I am using some other mods but nothing that should interfere.

Error log:
The mod Factorissimo 2 - notnotmelon fork (1.0.7) caused a non-recoverable error.
Please report this error to the mod author.

Error while running event factorissimo-2-notnotmelon::on_player_setup_blueprint (ID 70)
factorissimo-2-notnotmelon/blueprint.lua:55: attempt to index field '?' (a nil value)
stack traceback:
factorissimo-2-notnotmelon/blueprint.lua:55: in function <factorissimo-2-notnotmelon/blueprint.lua:47>

Same error, but when trying to copy some stone furnaces or steel chests or burner assembly machines, or basically anything else I try to copy. Haven't even researched or used anything Factorissimo yet. Guess I'll roll back to 1.0.6 for now.

This is fixed in the next update. Should be rolling out within the hour

Fixed in 1.0.8

I am currently on version 1.0.8 (also using other mods) and getting an error when trying to copy using CTRL-C. The error occurs when trying to copy tiles only, for example highlighting only concrete or stone bricks generates the error below. If an entity is included in the selection for example a substation the error does not occur.

The mod Factorissimo 2 - notnotmelon fork (1.0.8) caused a non-recoverable error.
Please report this error to the mod author.

Error while running event factorissimo-2-notnotmelon::on_player_setup_blueprint (ID 70)
factorissimo-2-notnotmelon/blueprint.lua:54: bad argument #1 of 2 to 'ipairs' (table expected, got nil)
stack traceback:
[C]: in function 'ipairs'
factorissimo-2-notnotmelon/blueprint.lua:54: in function <factorissimo-2-notnotmelon/blueprint.lua:47>

Fixed for the next release
:)

The mod Factorissimo 2 - notnotmelon fork (1.0.8) caused a non-recoverable error.
Please report this error to the mod author.

Error while running event factorissimo-2-notnotmelon::on_player_setup_blueprint (ID 70)
factorissimo-2-notnotmelon/blueprint.lua:54: bad argument #1 of 2 to 'ipairs' (table expected, got nil)
stack traceback:
[C]: in function 'ipairs'
factorissimo-2-notnotmelon/blueprint.lua:54: in function <factorissimo-2-notnotmelon/blueprint.lua:47>

the same error. when copying floortiles, buildings work fine . don't even understand why this mod would interact with that at all.

you responded to that while i was writing the last post. guess i just wait.

The new version is released, enjoy