GD Library installed, jpg enabled, no images

-- HikaShop version -- : HikaShop Starter 2.4.0, Joomla!® Online Shop System
-- Joomla version -- : Joomla! 2.5.28
-- PHP version -- : 5.3.14
-- Browser(s) name and version -- : Chrome 42.0.2311.135 m
-- Error-message(debug-mod must be tuned on) -- : The GD library for thumbnails creation is installed and activated on your website. However, it is not configured to support "jpg " images. Please make sure that you're using a valid image extension and contact your hosting company or system administrator in order to make sure that the GD library on your web server supports the image extension: jpg

Prior to importing my .csv file, i uploaded all relevant images having a .jpg extension to /images/com_hikashop/upload/ folder. GD library is installed:

GD Support enabled
GD Version bundled (2.0.34 compatible)
FreeType Support enabled
FreeType Linkage with freetype
FreeType Version 2.3.11
GIF Read Support enabled
GIF Create Support enabled
JPEG Support enabled
libJPEG Version 6b
PNG Support enabled
libPNG Version 1.2.49
WBMP Support enabled
XPM Support enabled
XBM Support enabled

the column headings i'm using are:

product_code | product_name | product_description | product_quantity | product_weight_unit |price_value | images

Under the "images" column i listed the xxxxxx.jpg name corresponding to each product... All other information was imported correctly without errors.

All products were imported successfully but no images appear in the backend products list or individual product information.

What did i do wrong?

thank you very much for the quick response and the exactly correct answer!

i performed a search/replace on my image filenames and within the .csv file and replaced all the extensions to make sure no spaces existed and then reuploaded the images and and reimported the .csv file after deleting the original files from joomla.

Voila! all my images appear in both the backend product listing and the frontend showcase!

Thank you!