Okay, before we get into my test results I will give a little more background information. Right around the time I upgraded to Mavericks I bought a QNAP TS-220 NAS and a NETGEAR R6250 Smart WiFi Router. The NAS is permanently connected to the router with a CAT6 ethernet cable. I put 4 TB of storage inside the NAS and transferred my iPhoto library onto it. When I was importing to iPhoto and having these issues, the files were being written to the NAS from the MacBook Pro via the Netgear router's WiFi connection.
Now the results. I did two tests.
The first: I created a new library folder ON MY HARD DRIVE (in the Pictures folder). This is where I had the library folder before I got the NAS and this is where it was when I never had these issues before. I imported all the photos that were on the SD card. NO ISSUES!
The second: I created a new library folder ON MY NAS. I turned off my MacBook Pro's WiFi and plugged an ethernet cable that runs to the Netgear router into the MacBook Pro's ethernet port. I imported all the photos that were on the SD card and the files were written to that new NAS folder. NO ISSUES!
So there you have it. Thank you Terence; I probably would have figured this out eventually but you helped me figure it out a lot quicker and you probably saved me a few extra days of frustration. The problem is more than likely happening in the WiFi connection. From now on I'll keep my library folder on my laptop's hard drive and work off that. When the folder gets too big I'll move it to the NAS for archive sake and create a new library folder on my laptop's hard drive. This should help avoid these pesky issues.
Again, thank you, and Happy New Year, Terence. Daniel says thank you for the complement on his hat!
Cheers!