Determining what caused a file permissions switch on networked storage can be tricky sometimes but, to change permissions on multiple files at once, the simplest way would be via Terminal with chmod.
sudo chmod -R 755 /home/bambuko/samba/thunderbird
This would set all files and directories within the /home/bambuko/samba/thunderbird directory to ...
I imported my photos using the gear icon on the far top right, 'Import Photos'. It sorta worked... It seemed to only get the month of April's photos for each year. Also the program seems to be crashing as soon as it loads occasionally.
Keep good backups until all this is sorted out.