Can you tell us what version of EasyEDA you are running? There used to be an issue with grid lines, wires and drawn lines being aliased out at certain zooms but since the V3.10.x upgrade it appears to have been fixed. EasyEDA should automatically update itself but if you are stuck at an earlier version doing `CTRL+F5` should bring it up to date. If all else fails then this will do it: https://easyeda.com/forum/topic/Manually_clear_offline_application_cache_if_EasyEDA_editor_page_cannot_update_to_new_version-5GE0YWhDn Please post back if the problem persists.

Clearing the app cache in Chrome seems to have done it. thanks.