PP displays two dialogue boxes before timeline appears...

Hi,

Many thanks for reading this!

I have two smallish issues (apart from the regular suddenly crashing that happens every few minutes and the huge amount of time it takes for PP2019 to start up).

I have searched for answers so apologies if this is covered elsewhere.

Two dialogue boxes appear before the timeline appears:

1. LOAD PROJECT DIALOGUE BOX

I'm told that a list of transitions are missing even though they are definitely there as I use them regularly!

********************************

Video Transition missing:  Impact Blur Dissolve

Video Transition missing:  Impact Push

Video Transition missing:  Impact Rays

Video Transition missing:  Impact Wipe

Video Transition missing:  Impact Zoom Blur

********************************

2. LINK MEDIA DIALOGUE BOX:

I'm then told that a whole list of media items (mostly png, jpg), supposedly in Dropbox, aren't there.

I don't understand two things:

1. why PP is wanting to find these files because they aren't in my asset bin or timeline.

2. I have had no media items in Dropbox since Summer 2017.

Is there a way of stopping PP looking for files that aren't there in places that don't exist?

Very many thanks for any help.

Dan

In case it helps I'm using:

PP CC 2019: Version 13.0.1 (Build 13)

Windows 10 Home 64bit

Dell XPS8900 BIOS 2.4.0

Processor Intel Core i7-6700 CPU 3.40GHz (8CPUs) 3.4GHz

RAM 32768MB

GPU GeForce GTX745 (Driver 416.94)