Das dürfte kein Problem sein.
{vs}:Das sollte kein Problem sein.
When the auxiliary verbs dürfen and sollen are used for the Vermutung / Annahme sense, I wonder if there are nuances of meaning between the two.
I suppose sollen can be either in Indicative or in Konjunctive, while dürfen can only be in Konjunctive, when they are used to indicate an informed guess?
On another note: Does the Konjunctive sollte suggest that the speaker is somewhat less certain than when the Indicative soll is used?