Did you aware about changes in new PrestaShop version?
There a good article PrestaShop 1.7 FAQ that helps you understand better what expect in new version.
Please notice that new version is still not ready to use on the live system. Yesterday was published RC2 of PrestaShop 1.7. There a changes list available.
Currently, we not suggest upgrading your store to new PrestaShop version. There still a lot of modules that not prepare for new changes.
Our team is aware all of the changes in new shop version. We can tell that PrestaBay eBay Integration and PrestaBay eBay Import are ready for work on PrestaShop 1.7. Both of modules are tested against PrestaShop 1.7 and adapted to all requirements. So all our ebay modules are ready for work on PrestaShop 1.7.
If you want to start to use PrestaShop 1.7 please contact us to receive latest module version which includes support of this shop version.