Hi!
When copying a sequence over the +1 site of the sequence, the sequence is "splitted" by a new line. Although, that shouldn't be like that (because the real molecule is circular), the real issue comes copying the reverse complementary.
To make it easier, lets say that the circular sequence (2000 bp) "ends" with "Ts" and starts with "As":

Original sequence:                                          
                                           |+1
GGGAGGAGGAGGAGGAGTTTTTTAAAAAATAATAATAATAATAATAATAA
                                   2000|


Copying that region (Ctrl +c), UGENE returns:

GGGAGGAGGAGGAGGAGTTTTTT
AAAAAATAATAATAATAATAATAATAA

Removing the new line solves the problem:
GGGAGGAGGAGGAGGAGTTTTTTAAAAAATAATAATAATAATAATAATAA


But copying the reverse complementary (Shif + Ctrl +c) returns:

AAAAAACTCCTCCTCCTCCTCCC
ATTATTATTATTATTATTATTTTTT

Here removing the new line creates a sequence that doesn't exist:
AAAAAACTCCTCCTCCTCCTCCCATTATTATTATTATTATTATTTTTT

The end result should be (reverse complementary to the original):
TTATTATTATTATTATTATTATTTTTTAAAAAACTCCTCCTCCTCCTCCC

Feature request: In the latest versions of UGENE it is possible to copy trough the +1 position like shown above. Nevertheless, that is only possible manually selecting the sequence with the circular view, but not with the Select range dialogue (Ctrl +a). It would be nice to have that option as well.

Thanks

UGENE v 1.9.0

Thank you for the report!
Fixed in 1.9.1